Mobile robot



FIG. 1 is a perspective view of the design for a mobile robot;

FIG. 2 is a front view thereof, the rear view being identical thereto;

FIG. 3 is a left view thereof, the right view being identical thereto;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines shown in the figures depict portions of the mobile robot that form no part of the claimed design. 

CLAIM The ornamental design for a mobile robot, as shown and described. 